CVE-2026-47775
Last modified
CVE-2026-47775 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, the OAuth2 HTTP filter's encrypt()/decrypt() functions use AES-256-CBC without an authentication tag (no HMAC, no AEAD). EPSS estimates a 0.21% chance of exploitation in the next 30 days.
Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, the OAuth2 HTTP filter's encrypt()/decrypt() functions use AES-256-CBC without an authentication tag (no HMAC, no AEAD). The /callback endpoint returns HTTP 302 on successful decryption and HTTP 401 on padding failure, creating a padding oracle. An attacker who obtains the encrypted CodeVerifier cookie can recover the plaintext PKCE code_verifier in ~6,200 requests (~100 seconds), then exchange it with a stolen authorization code to obtain the victim's access token. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Envoyproxy | Envoy | >= 1.35.0, < 1.35.11 |
| Envoyproxy | Envoy | >= 1.36.0, < 1.36.7 |
| Envoyproxy | Envoy | >= 1.37.0, < 1.37.3 |
| Envoyproxy | Envoy | >= 1.38.0, < 1.38.1 |
References
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7pExploit, Vendor Advisory, Mitigation
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7pExploit, Vendor Advisory, Mitigation
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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